Sachin Kasana articles - 28 total
I Stopped Using Online Diff Checkers and JWT Tools Blindly. Here’s Why I Built My Own
At some point, I realized I was pasting sensitive production data into tools I knew nothing...
Production-Grade System Design in Node.js (2025): 20 Concepts Every Developer Should Master
“Scaling isn’t a feature — it’s survival.” Continue reading on JavaScript in Plain English »
13 Modern Node.js Features That Made Popular npm Packages Obsolete (with Real Use Cases)
The Node.js ecosystem has grown up Continue reading on JavaScript in Plain English »
️ 10 Node.js Security Best Practices You Shouldn’t Ignore in 2025
Node.js powers everything from hobby projects to mission-critical enterprise apps. But in 2025, the...
Production-Grade Node.js Permission Model: Lock Down Your Runtime
Use Node.js 24’s new permission model to secure your backend apps. Learn to lock down filesystem,...
Node.js 24 vs 22 in 2025: What’s New, What Breaks, and How to Upgrade Safely
Node 18 is EOL. Node 22 is stable, but Node 24 has next-gen features. Should you wait or upgrade...
Retry Logic in Node.js: How to Handle Flaky APIs Without Losing Your Mind
“We’ve all been there. Your Node.js app talks to a payment gateway or third-party API, and everything...
REST vs GraphQL vs OData — Choosing the Right API for the Right Job
REST vs GraphQL vs OData — Choosing the Right API for the Right Job “Not every app needs...
I Replaced My Spinner with a Skeleton — And My UX Skyrocketed
I Replaced My Spinner with a Skeleton — And My UX Skyrocketed 🚀 Let’s be honest. Loading...
Stop Using Switch Statements — Use a Lookup Object Instead
🚫 Stop Using Switch Statements — Use a Lookup Object Instead 🧠 Switch statements have been...
How Node.js Handles High Concurrency Without Threads (And Why It Still Blocks Sometimes)
“If Node.js is single-threaded, how the heck is it serving millions of users?” That’s one of the...
How Web Workers Saved My JavaScript App from Freezing on Every CSV Upload
A real-world performance fix that made my app usable again. Ever uploaded a...
Most people think lazy loading is always good.
Lazy loading your components? Awesome. But what if I told you it might be hurting your SEO and...
Avoid These Lazy Loading Mistakes That Could Slow Down Your Website (with Real Fixes)
Stop Hurting Your Page Speed: Common Lazy Loading Mistakes & How to Fix Them Lazy loading is...
Dockerizing Node.js for Developers (Not DevOps)
“Docker doesn’t have to be scary — especially when it’s built for developers, not DevOps...
SOLID Principles in JavaScript & TypeScript — Real-World Examples You Can Actually Use
🚀 SOLID Principles in JavaScript & TypeScript — Real-World Examples You Can Actually...
10 Node.js Best Practices I Wish I Knew Sooner
Build scalable, secure, and production-ready Node.js apps like a pro. ✨...
I Built a Free JSON Formatter & Viewer for Developers — Feedback Welcome!
I Built a Free JSON Formatter and Viewer for Developers Hey Developers, I often needed a...
Design Patterns in JavaScript — Part 4: The Adapter Pattern
Originally published on Medium, sharing here for the DEV community! Design Patterns in...
️️ Design Patterns in JavaScript — Part 3: The Observer Pattern
Design Patterns in JavaScript -Part 3: The Observer Pattern “React to changes. Decouple...
Design Patterns in JavaScript — Part 2: The Factory Pattern
🏭 Design Patterns in JavaScript — Part 2: The Factory Pattern Imagine this… You’re...
Design Patterns in JavaScript — Part 1: Singleton & Module (With Real Examples)
🔁 Design Patterns in JavaScript — Part 1: Singleton & Module (With Real...
How to Monitor Frontend Errors Like a Backend Pro
Seen this before? 👇 “Everything works on my machine.” But when your app goes live… suddenly the...
⚡ From 5s to 500ms: How I Reduced My Page Load with Real Metrics
Every second of delay means a drop in engagement, conversions, and search ranking . That’s...
10x Your App’s Speed: Migrate to the New Node.js and Unlock Performance Features
Seen your Node.js app lag recently under real traffic? You’re not alone — many apps built on older...
From 10 Seconds to 2: Real Techniques for Reducing Load Times with Practical Examples
Introduction Website load time has a powerful impact on user experience, search engine...
Mastering Web Rendering: Choosing the Right Strategy for Your Site’s Speed and SEO
Mastering Web Rendering: Choosing the Right Strategy for Your Site’s Speed and SEO In today’s...
Node.js Array Limits: What’s the Maximum Length You Can Reach?
Imagine you’re in an interview, and you get asked a seemingly simple question: “ What is the maximum...